Property and Equipment

12 Months Ended

Dec. 31, 2020

8. PROPERTY AND EQUIPMENT

Property and equipment consisted of the following at December 31:



	Estimated Useful Life	2020		2019
Generators and other capital equipment	1-3 years	$	18,669	$	20,167
Building under finance lease	15 years		14,250		14,250
Computer and other office equipment	3 years		8,045		7,606
Machinery, equipment and vehicles	3-7 years		6,697		5,905
Furniture and fixtures	3-7 years		5,849		5,009
Leasehold improvements	5-15 years		8,645		6,078
Construction in progress	N/A		2,067		5,708
Land	N/A		502		502
Equipment under finance leases	3-5 years		409		483
Total			65,133		65,708
Less accumulated depreciation			(36,843)		(33,062)
Property and equipment, net		$	28,290	$	32,646

Property and equipment depreciation expense was $7,866, $7,423 and $7,244 for the years ended December 31, 2020, 2019 and 2018. Depreciation related to generators and other capital equipment was $2,503, $2,910 and $3,191 for fiscal years 2020, 2019 and 2018. As of December 31, 2020 and 2019, the net carrying value of generators and other capital equipment was $3,410 and $4,272.